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Tracheoscopy images of a dog at the initial (A) and follow-up presentations (B). A — An image at the level of the severe tracheal narrowing with 75% collapse of tracheal lumen. The tracheal mucosal surface was edematous with blood-tinged mucoid material. No obvious evidence of tracheal necrosis or granulation tissue was present. B — An image showing the same level of trachea shown in A. Tracheal diameter and edematous appearance were both substantially improved.
